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    Manylion
    Hierarchaeth
    Safleoedd Cysylltiedig
    Rhif Archif
    6428993
    Disgrifiad
    Looking N along Smith's Canal formation from N tunnel portal, White Rock Copper Works.
    Enw Casgliad
    Investigators' Photographs
    Cyfrwng
    Photo.
    Cychwynnwr
    Stephen R. Hughes
    Dyddiad
    1993-01-01